The remaining money left can instead be in bitcoin and not necessarily as an investment, because we may need to use it anytime and that will not be a disappointment on us selling at unprepared time, i know bitcoin to be of a profitable asset and there is much possibility of making more profits if we have our assets, investments or any money for upkeep in bitcoin, because we are having control in it and are in full custody of what belongs to us, not only this, we still stand a chances of earning more as the market provides volatility and by this we can earn when it rises.
If I'm to be you I will not do that because you could be using your hand to create a lost for yourself, if you don't want to use the money for Bitcoin then don't send it on your Bitcoin investment, you can choose another form to save but exclude it because a habit can be develop this way were you will began to withdraw more than the money you saved on the Bitcoin and that's how the emptiness of the account will come, and also apart from this the reduction of money if it did not affect the main investment is also high, so would you rather save to withdraw complete money or saving were you will only recover half.